Tài liệu Displays ppt

All Mac screens today can make the screen picture larger or smaller, thus accommodating different kinds of work.. You perform this magnification or reduction by switching among differen

9.9 Displays

Displays is the center of operations for all your monitor settings Here, you set your monitor's resolution, determine how many colors are displayed onscreen, and calibrate color balance and brightness

Tip: You can open up this panel with a quick keystroke from any program on the Mac

Just press Option as you tap one of the screen-brightness keys on the top row of your keyboard

The specific controls you'll see here depend on the kind of monitor you're using, but here are the ones you'll most likely see:

9.9.1 Display Tab

This tab is the main headquarters for your screen controls It governs these settings:

• Resolutions All Mac screens today can make the screen picture larger or smaller, thus accommodating different kinds of work You perform this magnification or reduction by switching among different resolutions (measurements of the number

of dots that compose the screen) The Resolutions list displays the various

resolution settings your monitor can accommodate: 800 x 600, 1024 x 768, and so

on (Figure 9-10)

When you use a low-resolution setting, such as 800 x 600, the dots of your screen image get larger, thus enlarging (zooming in on) the picture —but showing a smaller slice of the page Use this setting when playing a small QuickTime movie, for example, so that it fills more of the screen (Lower resolutions usually look blurry on flat-panel screens, though.) At higher resolutions, such as 1280 x 800, the screen dots get smaller, making your windows and icons smaller, but showing more overall area Use this kind of setting when working on two-page spreads in your page-layout program, for example

FREQUENTLY ASKED QUESTION The Password-Protected Screen Saver

I like the fact that when I wander away from my desk, the screen saver protects whatever I was doing from prying eyes But whoever walks by can just press a

key to exit the screen saver, so big deal! I looked all over, and couldn't find any

way to make the Mac require a password before exiting the screen saver

You had the right idea—you were just looking in the wrong place

In System Preferences, click Security There's the checkbox you're looking for:

"Require password to wake this computer from sleep or screen saver."

You're welcome

• Colors Today's Mac monitors offer different color depth settings, each of which permits the screen to display a different number of colors simultaneously The Colors pop-up menu generally offers only three choices: 256 Colors, Thousands, and Millions

Tip: You can still make your monitor gray scale (shades of gray), even if no

choice for it appears here The trick is to visit the Universal Access panel,

described later in this chapter

• Refresh Rate This pop-up menu (available for CRT screens only—that is, not flat panels) lets you adjust how many times per second your screen image is repainted

by your monitor's electron gun Choose a setting that minimizes flicker

• Brightness, Contrast Use these sliders to make the screen look good in the

prevailing lighting conditions The Contrast control appears only on CRT

monitors, and you'll usually want it all the way up The Brightness slider is usually best near the middle

Of course, most Apple keyboards have brightness-adjustment keys, so these

software controls are included just for the sake of completeness

Figure 9-10 In the early days of the Mac, higher color settings required a sacrifice in speed, since the Mac had to compute the color for thousands of individual pixels Today, there's little downside to leaving your screen at its maximum depth setting ("Millions" of colors) Photos, especially, look best at higher depth settings (The Detect Displays button appears primarily on laptops; it means "Check for an external monitor or projector.")

Tip: You can adjust the color depth and resolution of your monitor without having

to open System Preferences Just turn on "Show displays in menu bar," which adds

a Monitors pop-up menu (a menulet) to the right end of your menu bar for quick adjustments

• Automatically adjust brightness as ambient light changes This option appears only if you have a PowerBook or MacBook Pro with a light-up keyboard In that case, your laptop's light sensor also dims the screen automatically in dark rooms—

if this checkbox is turned on

9.9.2 Geometry Tab

This pane appears only on Macs with those increasingly rare CRT (that is, non-flat) screens It lets you adjust the position, size, and angle of the screen image on the glass itself—controls that can be useful in counteracting distortion in aging monitors

Tip: Don't miss the opportunity to eliminate the black borders around your screen

perimeter! That's just wasted space Click the Height/Width button Then click the

"expand vertical" and "expand horizontal" buttons at the lower-right corner of the

miniature monitor image until you've eliminated the black borders around the screen (You'll probably have to recenter the whole picture, too.)

9.9.3 Arrangement Tab

From the dawn of the color-monitor era, Macs have had a terrific feature: the ability to exploit multiple monitors all plugged into the computer at the sametime Any Mac with a video-output jack (laptops, iMacs, eMacs), or any Mac with a second or third video card (Power Macs, Mac Pros), can project the same thing on both screens (mirror mode ); that's useful in a classroom when the "external monitor" is a projector

Tip: The standard video card in a MacPro has jacks for two monitors By installing more

video cards, you can get up to six monitors going at once

But it's equally useful to make one monitor act as an extension of the next For example, you might have your Photoshop image window on your big monitor, but keep all the Photoshop controls and tool palettes on a smaller screen Your cursor passes from one screen to another as it crosses the boundary

FREQUENTLY ASKED QUESTION Blurry Flat-Panel Screens

Yucko! I tried the 800 x 600 setting on my MacBook, and everything got all

blurry and big! How do I fix it?

On any flat-panel screen—not just laptop screens—only one resolution setting

looks really great: the maximum one That's what geeks call the native

resolution of that screen

That's because on flat-panel screens, every pixel is a fixed size At lower

resolutions, the Mac does what it can to blur together adjacent pixels, but the

effect is fuzzy and unsatisfying (On a bulky CRT monitor, the electron gun can actually make the pixels larger or smaller, so you don't have this problem.)

You don't have to shut down the Mac to hook up another monitor—just put it to sleep Or just hook up the monitor or projector and then choose Detect Displays from the Displays menulet

When you open System Preferences, you see a different Displays window on each screen,

so that you can change the color and resolution settings independently for each Your Displays menulet shows two sets of resolutions, too, one for each screen

If your Mac can show different images on each screen, your Displays panel offers an Arrangement tab, showing a miniature version of each monitor By dragging these icons around relative to each other, you can specify how you want the second monitor's image

"attached" to the first Most people position the second monitor's image to the right of the first, but you're also free to position it on the left, above, below, or even directly on top of the first monitor's icon (the last of which produces a video-mirroring setup) For the least likelihood of going insane, consider placing the real-world monitor into the

corresponding position—to the right of your first monitor, for example

For committed multiple-monitor fanatics, the fun doesn't stop there See the microscopic menu bar on the first-monitor icon? You can drag that tiny strip onto a different monitor icon, if you like, to tell Displays where you'd like your menu bar to appear (And check out how most screen savers correctly show different stuff on each monitor!)

9.9.4 Color Tab

The Color pane lets you choose an accurate ColorSync profile for your screen (Section 14.8.1), and to calibrate it for correct color display

When you click Calibrate, the Display Calibrator Assistant opens to walk you through a series of six screens, presenting various brightness and color-balance settings in each screen You pick the settings that look best to you; at the end of the process, you save your monitor tweaks as a ColorSync profile that ColorSync-savvy programs can use to adjust your display for improved color accuracy